Firefox Unbranded Build Downloads

Unbranded Firefox versions are created specifically for developers to test their add-ons in without having to get development versions signed.

Mozilla introduced add-on signing some time ago and will make it a requirement without override in Stable and Beta starting with Firefox 48.

Firefox Stable and Beta versions cannot override add-on signing anymore which means that users cannot install unsigned add-ons in those browser versions. A switch was provided up until now to bypass this, but it will be removed with the release of Firefox 48.

Firefox ESR, Developer and Nightly editions ship with the override so that unsigned add-ons can be installed.

This posed a problem for add-on developers who wanted to test add-ons in development against Stable and Beta versions of Firefox. Simply speaking, with the restriction in place, they could not do so anymore without getting the development version signed first.

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